具有荧光增白作用的新型返黄抑制剂的合成及性能

以4,4'-二氨基二苯乙烯-2,2'-二磺酸(DSD酸)为原料,三聚氯氰为交联单体,将自由基捕获剂2,2',6,6'-四甲基哌啶胺(4-氨基哌啶)与二苯乙烯荧光增白剂引入同一分子中,经过亲核取代等设计出既含有荧光增白基团又具备自由基捕获功能的双三嗪氨基二苯乙烯荧光增白型的新型返黄抑制剂。采用红外和核磁光谱、紫外光谱、荧光光谱分析方法对其结构及其光学性质进行了初步研究,并通过紫外线加速老化实验考察了目标产物对化机浆纸张的返黄抑制效果。实验结果表明:合成的目标产物在涂布中的最佳浓度用量为0.8%,经过48 h光老化处理后,合成的产物光抑制效果更好,更适合作光诱导返黄抑制剂,与单独使用荧光增白剂和受阻胺类返黄抑制剂相比,老化后纸张的白度分别少下降了3.38%ISO和6.49%ISO。     

基于二苯乙烯荧光增白剂的多功能光稳定剂的合成及性能

以三聚氯氰为交联单体,将紫外线吸收剂2,4-二羟基二苯甲酮与二苯乙烯型荧光增白剂引入同一分子中,再与聚乙二醇系列产品发生缩聚反应合成了结构新颖的多功能光稳定剂(FBs)。采用红外光谱、核磁共振波谱、紫外光谱、荧光光谱等分析方法对其分子结构及光学性质进行了表征和初步研究,并考察其在纸张上的应用效果。结果表明,经光照后,双三嗪氨基二苯乙烯荧光增白剂(VBL)活性组分只占28.86%,而多功能光稳定剂FBs-400占61.80%,并且质量浓度超过1 g/L后出现荧光浓度自猝灭,比VBL(1×10-5kg/L)使用范围更广;紫外光加速老化实验表明,合成的多功能光稳定剂对纸张增白效果及光抑制效果更好,能显著提高光化学稳定性。     

含二苯甲酮的香豆素型光稳定剂的合成及应用

以对甲苯磺酸为酸性催化剂,使间苯二酚和乙酰乙酸乙酯发生脱水缩合反应,合成了具有紫外线吸收性能的7-羟基-4-甲基香豆素。通过三聚氯氰,将7-羟基-4-甲基香豆素和紫外线吸收剂2,4-二羟基-二苯甲酮引入同一分子中,再引入水溶性分子牛磺酸,合成了含二苯甲酮的香豆素型光稳定剂。采用红外光谱和核磁共振氢谱等手段对合成物质进行了结构表征,运用紫外光谱、荧光光谱测试其光学性质,并通过紫外光加速老化实验考察了合成产物对高得率浆纸张的抗紫外光老化效果。结果表明,在各自的最佳用量下,经48 h光老化处理,合成的香豆素型光稳定剂对纸张的光老化抑制效果优于单一的反应型紫外吸收剂及传统的荧光增白剂,白度分别少下降了2.14%ISO和3.13%ISO。     

树枝状大分子PAMAM—FBs合成及其在洗涤剂中的应用

三聚氯氰与4,4'-二氨基二苯乙烯-2,2'-二磺酸和2种氨基化合物经过三步缩合反应可得到三嗪基氨基二苯乙烯型荧光增白剂,作者用聚酰胺-胺G1.0(PAMAM)代替其中一种氨基化合物,合成聚酰胺-胺改性高分子荧光增白剂(PAMAM-FBs).实验显示,添加PAMAM-FBs的洗涤剂,增白性能以及耐光性均得到明显改善.确定了PAMAM-Ftks在液体洗涤剂中的适宜用量.     

用于高得率浆纸张增白的二苯乙烯型水性聚氨酯荧光乳液的合成及其性能

为了改善二苯乙烯型荧光增白剂的光异构现象及在高得率浆纸表面的吸附性，以三聚氯氰为交联单体，将4,4'-二氨基二苯乙烯-2,2'-二磺酸、乙醇胺和对氨基苯磺酸依次引入同一个分子中制得荧光单体（SFBs），进一步将其作为扩链剂制备了二苯乙烯型水性聚氨酯荧光(SWPU)乳液。采用¹H NMR、FTIR、UV-vis、荧光光谱、乳液粒径分析仪和稳定性分析仪等对所制备的荧光单体和乳液的结构和性能进行表征，最后其SWPU乳液用于高得率（杨木化机浆APMP）纸张表面施胶，通过紫外光加速老化试验对比了空白纸样和经SWPU乳液涂布后纸样的白度值，通过抗张强度检测、纸样吸水性Cobb值检测对比纸样的物理性能变化。结果发现，制备的二苯乙烯型水性聚氨酯荧光乳液粒径分布窄，平均粒径为66.78nm，乳液稳定性良好，经SWPU乳液涂布后的纸样初始白度比空白纸样增加了15.6%(ISO)；经48h光老化处理，空白纸样白度降低了17.56%(ISO)，而涂布纸样的白度只降低了13.39%(ISO)；另外，涂布后纸样的抗张强度增大，Cobb值减小；说明制得的SWPU乳液在高得率浆纸表面有良好的吸附性，并具有一定的增白、抑制纸张返黄和提高纸张物理强度效果。     

基于香豆素型荧光增白剂的返黄抑制剂的合成与性能研究

采用Pechmann法,以间苯二酚和乙酰乙酸乙酯为原料,在酸催化剂下发生脱水缩合反应合成了7-羟基-4-甲基香豆素荧光增白剂。再以三聚氯氰为交联分子,将受阻胺型光稳定剂2,2,6,6-四甲基哌啶胺与香豆素型荧光增白剂引入同一分子中,再引入牛磺酸,合成了一种新型的高得率浆返黄抑制剂。采用红外光谱对返黄抑制剂的结构进行表征,并用紫外光谱、荧光光谱探讨了其返黄抑制机理,通过紫外光加速老化实验考察了返黄抑制剂的应用效果。结果表明,合成的返黄抑制剂的返黄抑制效果优于7-羟基-4-甲基香豆素和2,2,6,6-四甲基哌啶胺。     

基于香豆素型荧光增白剂的返黄抑制剂的合成与性能

采用Pechmann法,以间苯二酚和乙酰乙酸乙酯为原料,在酸催化剂下发生脱水缩合反应合成了7-羟基-4-甲基香豆素荧光增白剂。再以三聚氯氰为交联分子,将受阻胺型光稳定剂2,2,6,6-四甲基哌啶胺与香豆素型荧光增白剂引入同一分子中,再引入牛磺酸,合成了一种新型的高得率浆返黄抑制剂。采用红外光谱对返黄抑制剂的结构进行表征,并用紫外光谱、荧光光谱探讨了其返黄抑制机理,通过紫外光加速老化实验考察了返黄抑制剂的应用效果。结果表明,合成的返黄抑制剂的返黄抑制效果优于7-羟基-4-甲基香豆素和2,2,6,6-四甲基哌啶胺。     

聚乙烯醇改性荧光增白剂的制备及其在洗涤剂中的应用

三聚氯氰与4,4'-二氨基二苯乙烯-2,2'-二磺酸和2种氨基化合物经过三步缩合反应可得到三嗪基氨基二苯乙烯型荧光增白剂,本文用聚乙烯醇(PVA)代替其中一种氨基化合物,合成聚乙烯醇改性高分子荧光增白剂(PVA-FBs).实验显示,添加了PVA-FBs的洗涤剂增白性能以及耐光性均得到明显改善.确定了PVA-FBs在液体洗涤剂中的适宜用量.     

淀粉-阳离子接枝共聚荧光乳液的制备及性能

以4,4'-二氨基二苯乙烯-2,2'-二磺酸为母体、三聚氯氰为桥联剂,利用亲核取代法制备了具有紫外吸收性能的二苯乙烯型荧光单体(FBs),然后采用接枝共聚技术将FBs、苯乙烯分别与二甲基二烯丙基氯化铵(DMDAAC)或甲基丙烯酰氧乙基三甲基氯化铵(DMC)接枝聚合在淀粉大分子上,制备两种阳离子荧光乳液(ST-DMDAAC-FBs,ST-DMC-FBs).采用1HNMR、FTIR、UV-Vis、荧光光谱对产物的结构及光学性能进行表征;通过抗张强度、接触角、紫外光老化实验、SEM等手段对施胶前后纸张的物理性能进行测试.结果表明,经ST-DMDAAC-FBs、ST-DMC-FBs施胶纸张的抗张强度相比空白纸张分别提高43.1％、39.7％,白度分别提高15.52％ISO、15.28％ISO,返黄值分别降低1.88、1.75.说明ST-DMDAAC-FBs、ST-DMC-FBs均可以提高纸张白度与强度、抑制纸张返黄,且ST-DMDAAC-FBs对纸张的作用效果更佳.     

二苯乙烯型荧光聚合物SiO_2纳米粒子复合物的制备及性能

以4,4￠-二氨基二苯乙烯-2,2￠-二磺酸(DSD酸)为发光母体、三聚氯氰为交联剂,利用亲核取代反应将对氨基苯磺酸、壳寡糖引入到发光母体上,合成了一种悬挂型壳寡糖荧光低聚物(COS-FBs)。然后,将其作为反应原料,利用改进的St?ber合成法制备出了一种改性荧光纳米粒子聚合物(Si O_2/COS-FBs)。利用FTIR、XPS和TEM对其理化性质进行了表征,UV-vis和荧光光谱考察了其光物理性能,同时也通过紫外老化实验考察了其在纸张上的返黄抑制效果。结果表明:Si O_2/COS-FBs具有规则的球形结构,粒径为90 nm左右;经38 h光处理后,Si O_2/COS-FBs对纸张的光返黄抑制效果优于COS-FBs,涂有Si O_2/COS-FBs纸张的白度降低量比COS-FBs纸张少2.53%ISO。     

季铵盐类荧光增白剂的合成及性能

三聚氯氰与4,4′-二氨基二苯乙烯-2,2′-二磺酸和两种氨基化合物经过三步缩合反应得到三嗪基氨基二苯乙烯型荧光增白剂,用三乙醇胺和三乙胺分别替代二乙醇胺和二乙胺,合成新型两性季铵盐类荧光增白剂,研究其与对比的非季铵盐类荧光增白剂的应用性能和在水溶液中的紫外吸收性能、光致异构化现象、荧光发射性能及其应用性能.结果表明：该季铵盐类增白剂耐酸碱性能明显提高,使用范围扩大,但其紫外吸收和荧光发射性能下降,且同样存在较为明显的光致异构化现象,耐光性也较差.     

Use of 2,4-Dihydroxybenzophenone-2‘-ammonium Sulphonate to Prevent the Yellowing of Wool by Ultraviolet Radiation

The use of 2,4-dihydroxybenzophenone-2′-ammonium sulphonate (das) to prevent the yellowing of wool by ultraviolet radiation is discussed. The optimum conditions of application of this absorber to wool have been determined. The Yellowness Index, a measure of the degree of yellowing, was used to determine the effect of the concentration of das on its protective action against ultraviolet radiation. Exposure in a Xenotest apparatus indicated that initially bleaching occurred, followed by yellowing, which decreased with increase in the concentration of das. The washing and dry-cleaning fastness properties of das on wool were assessed and the effect of dye on these properties was also determined, das has poor washing fastness, but this can be improved by mordanting the wool before treatment with das. This absorber does not significantly improve the light fastness of acid dyes on wool.     

The Synthesis and Study on Optical Characteristics of the Asymmetrical Polymerizable Fluorescent Brighteners

A novel type of asymmetrical polymerizable fluorescent brighteners was synthesized using 4-nitro-4-aminostilbene-2,2′-disulfonic acid (ANSD) and cyanuric chloride as raw materials, through reduction reaction of sodium hydrosulfide and condensation reaction of variant amine compounds replacing the chlorine of triazine rings, containing another dibasic triazine compound grafted polyaminamide. The ultraviolet absorption and fluorescence emission properties, photoinduced isomerization phenomena and application properties of the asymmetrical polymerizable fluorescent brighteners, asymmetrical and symmetrical fluorescent brighteners in aqueous solutions, tetrahydrofuran(THF) N,N-dimethyl formamide (DMF) were particularly investigated. The fluorescence quantum yield was determined using quinine sulfate in 0.5 mol/l H₂SO₄(Φ_F = 0.55) as the fluorescence standard. The effect of concentration and polarity of solvents on fluorescence properties was observed. Results show that the ultraviolet absorption and dyeing properties as well as light stability of the prepared asymmetrical polymerizable fluorescent brighteners increased obviously compared with asymmetrical and symmetrical FBs with the phenomena of photoinduced isomerization decreasing. It was found that the polarity of the solvents influences the quantum yield of fluorescence and has only a small effect upon the positions of the absorption and fluorescence maxima of FBs. Meanwhile, concentration of trans- and cis-isomers depends on the nature of the substituents.     

助剂对透明聚氨酯弹性体耐黄变性能的影响

通过正交试验考察了在不同环境下不同的抗氧剂、紫外线吸收剂、助抗氧剂以及光稳定剂对透明聚氨酯弹性体耐黄变性能影响,优化了不同环境下的最佳助剂组成.结果表明:在室内避光条件下影响材料耐黄变性能的助剂主次顺序为助抗氧剂＞紫外线吸收剂＞光稳定剂＞抗氧剂;在室内日光灯照射条件下影响材料耐黄变性能的助剂主次顺序为紫外线吸收剂＞助抗...     

Effect of microbial treatment on brightness and heat‐induced brightness reversion of high‐yield pulps

BACKGROUND: The manufacture of high‐yield pulps is attractive due to its efficient utilization of lignocellulosic material. However, their rapid brightness reversion when exposed to heat and light restricts their more widespread use in high‐quality papers. This study investigated the potential of bio‐treatment with more than 30 species of fungi and yeasts to inhibit heat‐induced yellowing of high‐yield pulps. RESULTS: Treatment with Penicillium sp. ZCF34, Saccharomyces cerevisiae INVS2 and 724 reduced the brightness reversion and increased the brightness of wheat straw semi‐chemical pulp after 4 days incubation (postcolor number decreased by 33.96%, 66.42% and 57.09%, and brightness increased by 0.84%ISO, 0.48%ISO and 0.89%ISO, respectively). Phanerochaete chrysosporium W14 treatment was best for depressing yellowing of bleached aspen CTMP (chemi‐thermo‐mechanical pulp) and Saccharomyces cerevisiae AH22 treatment gave the highest brightness and a lower postcolor number. For unbleached aspen CTMP, treatment with Fusarium concolor X4 and Saccharomyces cerevisiae H158 was effective in improving brightness and brightness stability after 2 and 4 days incubation, respectively. CONCLUSION: Treatment with some microorganisms increased pulp brightness and strongly suppressed heat‐induced yellowing. It offers an option for improving the brightness stability of high yield pulps and some valuable information for bio‐pulping and bio‐bleaching with microbial treatment. Copyright © 2009 Society of Chemical Industry